Hi Christian,
most likely Michel just pointed out the right solution.
There is an off by one in the bug fix, which might cause the issue.
We are still testing, but so far it looks good.
Regards,
Christian.
Am 08.05.24 um 12:36 schrieb Christian Heusel:
Hello,
I am reporting this to the regressions mailing list since it has popped
up in the [Arch Linux Bugtracker][0]. It was also [already reported][1]
to the relevant DRM subsystem, but is not tracked here yet.
The issue has been bisected to the following commit by someone on
Gitlab:
a6ff969fe9cb ("drm/amdgpu: fix visible VRAM handling during faults")
The DRM maintainers have said that this could be something that just
worked by chance in the past:
[Comment 1][2]
Christian König (@ckoenig)
Mhm, no idea of hand. But it could be that this is actually an
intended result.
Previously we didn't correctly checked if the requirements of an
application regarding CPU accessible VRAM were meet. Now we return an
error if things potentially won't work instead of crashing later on.
Can you provide the output of 'sudo cat
/sys/kernel/debug/dri/0/amdgpu_vram_mm' just before running the game?
[Comment 2][3]
Damian Marcin Szymański (@AngryPenguinPL):
@superm1 @ckoenig If you can't fix it before stable 6.9 can we get it
reverted for now?
Christian König (@ckoenig):
@AngryPenguinPL no, this is an important bug fix which even needs to
be backported to older kernels.
All in all this seems to be a rather tricky situation (especially
judging if this is actually a regression or not), so maybe getting some
input from the stable or regression team on how to handle this well
would be good!
(I'll add that I can give no direct input on the issue itself, see this
as a forward / cc type of Email.)
Cheers,
Chris
[0]: https://gitlab.archlinux.org/archlinux/packaging/packages/linux/-/issues/47
[1]: https://gitlab.freedesktop.org/drm/amd/-/issues/3343
[2]: https://gitlab.freedesktop.org/drm/amd/-/issues/3343#note_2389471
[3]: https://gitlab.freedesktop.org/drm/amd/-/issues/3343#note_2400933
#regzbot introduced: a6ff969fe9cb
#regzbot link: https://gitlab.freedesktop.org/drm/amd/-/issues/3343
#regzbot title: drm/amdgpu: Games crash if above 4g decoding/resize bar is disabled or not supported
